Passivation Process of Carbon Steel Cerium Salt and Silane Composite Membrane

2nd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Lei, Yahong^1 ; Guo, Jian^1 ; Wu, Chenhui^1 ; Li, Jie^1 ; Gao, Xin^1 ; You, Xiaojian^1

Wuhan Second Ship Design and Research Institute, Hu Bei

430064, China^1

关键词: Composition structure;    Corrosion performance;    Electrochemical impedance;    Metallographic microscope;    Orthogonal experiment;    SEM and EDS analysis;    Silane coupling agent;    X-ray energy dispersive spectrometry;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/170/3/032131/pdf
DOI  :  10.1088/1755-1315/170/3/032131

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In this paper, the acid quick passivation processwe adopted, put carbon steel after pretreatment, immerse in cerium salt solution and then form passivating film. Via orthogonal experiment, the optimum passivation process conditions are as follows: Ce(NO3)3.6H2O, 30 g/L; H2O2, 30 ml/L; pH value of 2; passivation time, 60s. Under the condition of the above, membrane resistance under the condition of 3% acidic copper sulfate intravenous drip experiment time can reach 1309s. Electrochemical impedance spectroseopy(EIS) measurements were assessed the corrosion resistane of passivation films; metallographic microscope and scanning electron microscopy(SEM) were used to characterize the composition structure and morphologies of sample surfaces; X-ray energy dispersive spectrometry (EDS) and X-ray photon spectro scopy (XPS) were used to identified the component of sample surfaces. The silane coupling agent was treated on the sample as two step passivation, in order to improve the anti-corrosion of cerium passivation film. Silane coupling agent secondary passivation process was that the sample was passivated for 1 minute in the KH-560 for 4% of silane coupling agent solution that the pH value is 2.5%, and cured for 1 hour under the condition of 120 °C . Neutral salt spray and EIS test results of cerium-silane composite passivation film show that theanti-corrosion performance of passivation film has been greatly improved. SEM and EDS analysis results showed that the silane coupling agent very well covered cracks and filled the pores on surface of the cerium salt passivation film.